<template>
    <el-container class="home-container">
      <!-- 头部区域 -->
      <el-header>
        <div>
          <!--黑马的logo-->
          <img src="../assets/heima.png" alt="黑马logo"/>
          <!--顶部标题-->
          <span>电商后台管理系统</span>
        </div>
        <el-button type="info" @click="logout"> 退出 </el-button>
      </el-header>
      <!-- 页面主体区域 -->
      <el-container>
        <!-- 侧边栏 -->
        <el-aside width="200px">
          <!-- 伸缩侧边栏按钮 -->
         <div class="toggle-button" @click="toggleCollapse">|||</div>
          <!--侧边栏-->
          <el-menu
            background-color="#333744"
            text-color="#fff"
            active-text-color="#ffd04b"
            :unique-opened="true"
            :collapse="isCollapse"
            :collapse-transition="false"
            router
            :default-active="activePath"
          >
            <!--一级菜单-->
            <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
              <!-- 一级菜单模板 -->
              <template slot="title">
                <!--图标-->
                <i :class="iconsObj[item.id]"></i>
                <!--文本-->
                <span>{{item.authName}}</span>
              </template>
              <!-- 二级子菜单-->
                <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                  <!-- 二级级菜单模板 -->
                    <template slot="title">
                      <!--图标-->
                        <i class="el-icon-location"></i>
                      <!--文本-->
                        <span>{{subItem.authName}}</span>
                    </template>
                </el-menu-item>
            </el-submenu>
          </el-menu>
        </el-aside>
        <el-container>
          <!-- 主体结构 -->
          <el-main>
            <!-- 路由占位符 -->
            <router-view></router-view>

          </el-main>
        </el-container>
      </el-container>
    </el-container>
</template>
<script>
export default {
  data() {
    return {
      // 左侧菜单项
      menuList: [],
      iconsObj: {
        125: 'iconfont icon-user',
        103: 'iconfont icon-tijikongjian',
        101: 'iconfont icon-shangpin',
        102: 'iconfont icon-danju',
        145: 'iconfont icon-baobiao'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的连接地址
      activePath: ''
    }
  },
  created() {
    // 在create阶段请求左侧数据
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout () {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的子菜单
    async getMenuList () {
      // 发送请求获取左侧菜单
      const { data: res } = await this.$http.get('menus')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.menuList = res.data
      console.log('左侧导航菜单数据：' + res.data)
    },
    // 点击按钮，切换菜单的折叠与展开
    toggleCollapse () {
      this.isCollapse = !this.isCollapse
    },
    // 保存连接的激活状态
    saveNavState (path) {
      window.sessionStorage.setItem('activePath', path)
      this.activePath = path
    }
  }
}
</script>

<style lang="less" scoped>
  .home-container {
    height: 100%;
  }
  .el-header {
    background-color: #373d41;
    display: flex;
    justify-content: space-between;
    padding-left: 0;
    align-items: center;
    color: #fff;
    font-size: 20px;
    > div {
      display: flex;
      align-items: center;
      span {
        margin-left: 15px;
      }
    }
  }
  .el-aside {
    background-color: #333744;
    .el-menu {
      border-right: none;
    }
  }
  .el-main {
    background-color: #eaedf1;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle-button {
    background-color: #4a5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>
